Align MappingElasticsearchConverter with other Spring Data converters

[mp911de]

• Add support for SpEL expressions via @Value.
• Simplify readCollectionOrArray to consider properly nested lists and maps
• Simplify readMap to allow reading generic maps and entities in maps

This allows adding Document to ElasticsearchSimpleTypes.
Also, update DefaultElasticsearchTypeMapper to report a fallback TypeInformation to properly convert nested maps.

Related ticket: #1675.